Help Getting data From DB

Hi Guys,
No need to say that im new using EXTJS (first post ).
Im having issues getting this example: http://www.foscode.com/populate-extjs-mysql-datastore/ to work. I Did the PHP page (myDBConnection.php) and, if i run it alone on the page, i get this result from my DB table :
{"myInventory":[{"nome":"Joao Silva da Souza de Almeida"},{"nome":"Maria Alvarenga"},{"nome":"Silvia Santos"},{"nome":"Fernando Fernandes"},{"nome":"Joaquina de Abreu"}],"totalCount":5}
Is that correct?
Assumig it is a good-to-go result, i did the next step that was using this on the js file. It is like this: